Directors Technical Interests

National Grid PLC
23 August 2006



23 August 2006     National Grid plc (NG)



Interests Notified by the Trustee of the National Grid plc 
Group Employee Share Trust


(Notification of Directors' Technical Interests,
Pursuant to Section 324 (2) of the Companies Act 1985)


NG today received a notification from Towers Perrin Share Plan Services
(Guernsey) Limited, as Trustee of the National Grid plc Group Employee Share
Trust (the 'Trust'), operated in conjunction with National Grid Share Award Plan
2004 (the 'Plan'), Performance Share Plan, Share Matching Plan and Deferred
Share Plan. Following the purchase of 50,881 Ordinary shares yesterday, at a
market price of 631.5p per share for future releases under the Plan, Executive
Directors of NG (Roger Urwin, Steve Holliday, Steve Lucas, Mike Jesanis, Edward
Astle and Nick Winser) are deemed to have a technical interest in the new
balance of 200,974 NG Ordinary shares held in Trust. The B Shares held by the
Trust remain unchanged.


(Note: For Companies Act purposes, the Executive Directors of NG are deemed to
have a technical interest in all shares held in the Trust, together with all
participating employees. The interest ceases when shares are transferred to
participants by the release of shares from the Trust under the Share Award Plan
or under another employees' share plan.)


Contact D C Forward, Assistant Secretary (0207 004 3226)


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